diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 7ca6233325..c639d1823b 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -20112,7 +20112,7 @@ static struct ast_channel *sip_request_call(const char *type, int format, void *
 {
 	struct sip_pvt *p;
 	struct ast_channel *tmpc = NULL;
-	char *ext, *host;
+	char *ext = NULL, *host;
 	char tmp[256];
 	char *dest = data;
 	char *dnid;